Added #define-switch for "watermarking" option:

Added #define-switch for "watermarking" option:
A transparent layer between the navigation buttons and the browsable
content protects the content from being printed by the Flash 6 Player
print command. Instead, the user will obtain a blank page.
This is a very weak protection and has nothing to do with cryptographic
watermarking but maybe it's useful for some applications.
By default the protection is disabled.